eyewitness testimony send a california man to prison for murder. the convicted man and his son says the witness was wrong. we'll show you what they are ,,, ♪ >>> tomorrow night "48 hours" focus on a father, a son and a murder case. frank o'connell promised he would always be there for his son nick but that was tough to do from a prison cell. as troy roberts the son always felt his father was innocent, the question, though, was could he prove it? >> reporter: when nick o'connell was 4 years old his father was sentenced 25 years to life for first degree murder but frank o'connell has always maintained his innocence. and nick has always believed him. >> every day for 27 years i wake up knowing a good, innocent man is being punished again today. >> i don't deserve this. i wasn't a thug in the community that they need to sweep up and get up off the streets. >> reporter: in 1984 l.a. county sheriff's detectives accused frank o'connell of shooting his ex-girlfriend's ex-husband and speeding off in a yellow pinto station wagon. when nick was 15 he read t